CVE-2019-10343 in Configuration as Code Plugin
Summary
by MITRE
Jenkins Configuration as Code Plugin 1.24 and earlier did not properly apply masking to values expected to be hidden when logging the configuration being applied.
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Analysis
by VulDB Data Team • 07/16/2020
The vulnerability identified as CVE-2019-10343 affects the Jenkins Configuration as Code Plugin version 1.24 and earlier, representing a critical security flaw in how sensitive configuration data is handled during logging operations. This issue stems from inadequate implementation of data masking mechanisms within the plugin's logging functionality, creating a scenario where confidential information may be inadvertently exposed through log files. The vulnerability specifically impacts the plugin's ability to properly hide sensitive values that should remain concealed during the configuration application process, potentially exposing credentials, passwords, or other privileged information to unauthorized parties who might access these logs.
The technical root cause of this vulnerability lies in the plugin's failure to apply proper sanitization or masking procedures to configuration values that are expected to be hidden. When Jenkins processes configuration files through the Configuration as Code plugin, certain fields such as passwords, API keys, or other sensitive parameters should be masked or obfuscated in log output to prevent exposure. However, the flawed implementation allows these values to appear in plain text within the logging output, making them accessible to any individual with access to the log files. This represents a direct violation of secure logging practices and demonstrates a lack of proper input validation and output sanitization within the plugin's codebase.
The operational impact of this vulnerability extends beyond simple information disclosure, as it creates potential attack vectors for malicious actors who may gain access to Jenkins log files through various means including system compromise, unauthorized user access, or misconfigured file permissions. Attackers could exploit this vulnerability to extract sensitive credentials and authentication tokens that are used within the Jenkins environment, potentially leading to unauthorized access to build systems, source code repositories, or other integrated services. The exposure of such information could result in complete compromise of the CI/CD pipeline, allowing attackers to manipulate builds, inject malicious code, or gain persistent access to the development infrastructure. This vulnerability particularly affects organizations that rely heavily on automated configuration management and logging practices, where log files serve as primary sources of operational visibility and debugging information.
Organizations should immediately upgrade to Jenkins Configuration as Code Plugin version 1.25 or later, which contains the necessary fixes to properly implement masking for sensitive configuration values. Additionally, system administrators should conduct comprehensive reviews of existing log files to identify and remediate any previously exposed sensitive information, implementing proper log rotation and access controls to minimize future exposure risks. Security teams should also consider implementing centralized log management solutions with enhanced filtering capabilities to prevent sensitive data from being stored in accessible locations. This vulnerability aligns with CWE-209, which addresses improper handling of sensitive information in logging contexts, and represents a significant concern from the ATT&CK framework perspective under the T1566 technique for credential access through exploitation of system vulnerabilities. The remediation process should include comprehensive testing to ensure that all sensitive fields are properly masked and that logging mechanisms do not inadvertently expose privileged information through configuration files or runtime outputs.